<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>

</body>

</html>
<script>
    function fn(a) {
        return function (b) {
            return function (c) {
                console.log(a + b + c);
            }
        }
    }
    fn(20)(38)(20)
</script>